Mechanism for shifting the cross-slides of lathes.



Patented May 18, 1909.

. In ven (fr: MWHanson y fais A 'orne HHIHH IIIIIIIIIIIINHN Il B. M. W. HANSON.

MEGHANISM FOR SHIPTING THB GROSS SLIDES 0F LATHES.

APPLICATION FILED JULY 11,

UNITED sTATEs TAATENT oEEIoE.

.Specification of Letters Patent.

Aplilier-nton filed July 11, 1906.

MECHANIBM 'FORLSHIFTING 'r1-1E oaoss-sLmEs oF LATHEs.

P`atented`May 18, 1909;

Serial No. 326,6(16.

the work, and the main object of the inven' tion is' the provision of means for accon'iplishlng tlns result.

.A further object of the 1n ventlon 1s the provision Vof mechanism applied to the cross-4 slide, and in which rotarymotion is con vertcd into variable speed .reciprocatory motion.

Other objects of the invention will be hereinafter set forth. i

-ln the accompanying drawings, Figure l is a sectional viewof the crossfslide and car- ,bodv 22.

riage of a lathe, parts beingshownin elevation. Fig. 2 is a sectional viewvon line 242 of Fig.V 1; Fig. 3 is a sectional view on line 3-3 of Fig. 1, certain parts being shown in an intormediate position; and Fig. 4 is a detail hereinafter described.

Like numerals designate similar parts throughout the several views.

Referring to the drawings, the numeral 1 designates a portion of a lathe-bed, 2 one of the ways thereof, and S, the usual carriage adapted for longitudinal recii'noration thereon.

Mounted np'on the carriage is a cross-slide 4 provided withfthe usual tool-postcarrying a lathe-tool 6, shown in position to engage the work7. Attached to the front of the carriage 3 by screws .8 is a bracket 9,

withinV which is located a bearing 10, bored `to receivethe slightly reduced part 11 of a shaft 12, said shaft being provided with an additional bearin in the carriage at 13, beyond which it is t ireaded to engage a nut '14 rigidly secured to. the underside of the crossslide 4. Keyed to the shaft 12 between bearings 10 and 13 is a barrel pinion 15, in mesh with a gear 16 carried by apron 17, and driven by mechanism (not shown) which constitutes a power cross-feed. To enable i the cross-slide to be operated b v hand, shaft 12 is equipped with a crank- ISsecured b a nut 19. Adjacent the end of bearing 10 is a micrometer gage 20 of which a detailed description'is ui'mecessary, as'it hasno bearing `on the present invention.

lnithin a bore 21 in the depending body (ill 22 of bracket 9 is a short shaft 23, having a '4 pinion 24 at its lower end, and provided vai its upper extremity with an eocentrifnllv` located wrist-pin 25 surrounded by a bushing' 26 fitted in a transverse slot 27 in the under side of bearing 10. Headed screws 28 prevent shaft 2 3 from being displaced from itsproperposition. f

Adjacent to shaft 23 and secured b v a pin 29 in a bor(` of the bracket f) is a stud-shaft 3() havingr mounted thereon a toothed segment 31 in mesh with pinion 24 of shaft 23. An extension 32 ofthe segment 3l terminates in a handle 33 b v menus of which said seg*- nent is operated, the are of trawl thereof being` limited to ninety degrees b v pro'ecting stops Ia and 35 (see full and dotted lines Fig. 2), which come in Contact with extensions 36 and 37, respectively, ofthe bracket- S .ginent 31 has a ratio to pinion 24 of one to two, and, therefore, a quarter turn of said segnwntI will turn shaft 23 one half of a revolution, and as the wrist-pin 25 of the f` 1shaft 23 carries the bushing.,r 26 which isiittcd 1n the` transverse slot 27 `of bearing' l0, 1t

'will impart to said bearing' a longitudinal travel equal in length to vthe throw of said wrist-pin 25, and will thereby shift theiscrew-V shaft 12 and all parts connected therewith from the full-line position to the dotand`` dash line position `representing the withdrawn point of tool 7, as illustrated in Fig. l.

A desirable feature of the conversion of-the j rotary motion of shaft 23 into the re'ciprm catory motion of bearing 1() exists in the variable speed produred'in the latter, the speed thereof' gradually increasing from the start and graduallyr decreasing toward the finish, thereby preventing objectioeable shock when either the advance or return movement of vthe cross-slide-eeases`.

A set-screw 38 threaded into the bracketbody 4 at 39, and provided with a brass shoe 40, serves to lock shaft 23'against rotation, should it be desirable rigidl)r to secure the bearing 10 to bracket 9.

Designated by -11 is a frame mounted on the carriage, and having a part thereof formed lll() as a sleeve 42, provided with an o ening 43 to receive an extension 44 of bracket 9, the conformation of said extension being similar in cross-section to bearing 10. (See Fig. 3). This sleeve 42 is of suHicient length to afford a space 45 between the pinion 15 and the end of the reduced bracket extension 44 which will permit of the necessary travel of the i bearing 10, andconnected parts, said bearing being mounted between the end of the pinion 15 and the handle 18, so that as it reciprocates the screw shaft 12 will movewith it.

Especial advantage may be derived from the userf this mechanism in cutting either internal or external threads, the operator being enabled in either case instantly to cause the tool 6 to engage or disengage the stock 7 by a slight movement of the handle 33 without in the least affecting the accurate adjustment of said tool necessary in the Work being done thereby.

The shaft o r plug 23 with its wrist or eccentric stud 25 presents a sim le and eicctive device for reciprocating tlie bearing 10 and also the feed screw 11 and for locking Said two parts in their extreme adjusted positions the lockingaction being Wholly automatic this bein quite advantageous when the bearing and s raft are locked. in their advanced positions in that they are rigidly and substantially held against rearward thrust by reason of which the tool of whatever character it may be will be unyieldingly maintained in contact with the Work.

lhile th'epreferredform of construction is disclosed in the accompanying drawings, it is distinctlyr to-be understood that the invention is not limited tothe precise elements shown and described, for many changes may be made, and it may be applied to various machines other thanthat s own, if desired.

Having thus described the invention, what I claim is:-

' 1. The combination of a tool-slide, a carriage on which said tool-slide travels, a nut` connected with said tool-slide, a screw coper'atve with the nut, for operating the slide, a bearing in which said screw turns, for reciprocating said screw and thereb said slide, and a turnable shaft supporte independently of the slide and having a Wrist pin for reciprocating said bearing.

2. 'lhe combination, with a tool-slide, and with a carriage upon which the same .is mounted, of a nut secured to the tool-slide; a screw working in said nut; a bracket secured to the carriage, and having a bore; a slotted bearing mounted lfor reciprocatory m'oveme'nt in thevbracket and connected to the screw-shaft and a ro'tary shaft having a wrstin fitted in the slot of the bearing.

3. he combination, with a tool-slide, and with a carriage upon which it is mounted for transverse adjustment, of a nut secured to the carriage; a screw working in the nut; a bracket secured to the carriage, and having a bore; a slotted bearing mounted for reciprocable movement in the bore of the bracket, said bearing being connected to the screwshaft an oscillatory shaft having a wrist-pin entering the slot of the bearing; means for oscillating said shaft; and stops for limiting the movement ofsaid shaft in either direction.

4. The combination, with a tool-slide, and with a carriage upon which it is mounted for transverse adjustment, of a nut secured to said tool-slide a screw Working in the nut; a bracket secured to the carriage and havingr a bore; a slotted bearing mounted in the bore of said bracket, said bearing being connected to the screw-shaft; a shaft having a wristpin Working in theslot of the bearing a pinion rigid with said shaft; and a sector for actuating the pinion.

5. The combination of a tool-slide, a car riage on which said tool-slidetravels, a nut connected to said tool-slide, a screw coperative with the nut, for operating said slide, a bearing for reci rocating said screw and thereby said sli e, a shaft provided with means for reciprocatinsaid bearing and also with a gear, s aid shaft eing supported independently of said slide, and a manually operated ear in mesh with said first mentioned ear or turning the latter and thereby efecting the reciprocation of said bearing,

- 'In testimony whereof I affix m signature in resence of two Witnesses, Qn t e 21st day of une, 1906.

BENGT M. W. HANsoN.

Witnesses:

KATHRYN T. M. OCONNELL, HENRY L. HUNTINGTON. 

